Improvement in hand-pieces for dental engines



G. H. CUSHING.

HAND-PIECE FOR DENTAL-ENGINES. No.169,34.-Z.

Patented Nov. 2, 1875.

WZZ7Z688 es.-

N. PETERS, FHOTO-LITHOGRAPHER. WASHINGTONv 0, C.

PATENT omen.

GEORGE H. OITSHIN G, OF CHICAGO, ILLINOIS, ASSIGNOR'TO SAMUELS.

WHITE, OF PHILADELPHIA, .PENNsYLvANIA.

IMPROVEMENT IN HA ND-P I ECE S FQR DENTAL ENGINES.

Specification forming partof Letters Patent No. 169,3 .12, dated November 2, 187 5 applicatedfi led September 21, 1875. z

To all whom it may concern:

Be it known that I, GEORGE H. UUSHING, of Chicago, Illinois, have invented certain new and useful Improvements in Diskand Tool Carriers for Dental Engines, of which the following is a specification:

My invention relates to a carrier of that class adapted for the support of rotary disks, burrs, and other revolving tools; and my objects are to render the disk or tool adjustable in the carrier at any desired angle thereto, and to insure steadiness of movement of the disk or tool while in operation.

The subjectmatter claimed will hereinafter specifically be designated.

In the accompanying drawings, which represent, on an enlarged scale, my improvements in connection with a disk or emery-wheel, Figure 1 is a plan or longitudinal view, Fig. 2, a longitudinal elevation; Fig. 3, a longitudinal central section; and Fig. 4, a view of the inner face or under side of the removable adjustable bearing and clamping-arm.

A tubular support or hand-piece is composed of two parts, A A, the outer-section A of which constitutes the toolcarrier, and is hinged to turn upon the main section A by pivots or trunnions a a, formed, in this instance, in one piece, with the end section of the hand-piece. The trunnion a fits so as to turn freely in a bearing in an arm or lug, B, projecting from the main section of the handpiece, While the trunnion a has its bearing in a yielding or spring arm, 12, formed, by preference, by the projecting end of a plate, B, secured upon the main part of the hand-piece by screws b b to admit of its removal or replacement. This plate may be partially countersunk in the hand-piece, which is shown as formed with a polygonal stud, a t0 fit into a correspondin-gly-shaped hole in the plate, thus preventing lateral strain on the screws. The under side or inner face of the arm bis serrated or provided with a ring of teeth, (J. Corresponding notches or serrations G are formed upon the hinged portion A of the hand-piece around the pivot a. The sections of the hand-piece may, it will thus be seen, be locked together by clamping these serrated surfaces against each other. A screw, D,

serves to prevent. the "accidental withdrawal of the trunnion a from its bearing,-as well as todraw it tightly down in place, the head of the screw bearin g, it will be seen, upon the shell of the main section ofthe handpiece around the trunnion; A pinch or set-screw, D, works in a female screw in the trunnion a, and serves to clamp the serrated faces 0 0 together to hold the hinged section or carrier in the desired position, relatively to the main section.

By loosening the screw D, the carrier of the hand-piece may be adjusted by slipping the serrations 0 past those 0, the arm b yieldin g to .permit them to slide one past the other.

By removing the plate B, which, as before described, sustains, by means of itsv springarm, one of the pivots of the hinged section A of the hand-piece, this section may be removed.

A shaft, E, through which the tool is driven, is rotated in the hand-piece in any suitable well-known way, such as by the flexible shaft of a dental engine, with which it may be connected by well-known means.

To allow of the adjustment of the outer or tool-supporting end of the hand-piece, as before described, it is necessary that the driving-shaft should be capable of flexing in the line of the joint in the hand-piece, or that the tool or its holder should be jointed to the shaft at this point.

I prefer to secure the shank or spindle F of the disk F to a chuck or tool holder, E, by a screw, 0, which readily admits of the removal and replacement of the disk, or the. substitution of another tool,and to connect this chuck with the shaft E in the line of the joint in the hand-piece by a universal joint, G, of wellknown construction, which will admit of the rotation of the tool at any angle to which it may be adjusted by the swinging of the section or carrier A.

The disk F may be connected with its spindle in any suitable Way, being shown in the drawings as clamped thereon between a collar, f, fast on or formed with the disk, and a nut, f. The collar, it will be seen, rotates against or close to the end of the carrier A.

By removing the screw 6 the disk and its shank may be withdrawn fromthe carrier,

itlle shankto revolve in, and, a burringjtool. or

other ,tpollprovided with a like shank. inserted.- in its place.

The hand-piece proper, it will be seen, ,is somewhat raised or projected out laterally to rm thene- B ie wem leirqo tmecqo mode the Joint eedt ielea tie ese n. The spring clampingarm likewise projects out slightly for the same purpose. The handpiece is recessedpr cnt ayvaybetvne en thelug B and clamp bto giv'eample play tothe swinging section or carrier.

I i ifie m, the de i sho Hi k: mans *Patent; No. 158,37 7 of January 5,187.53

I do not broadly claim adjusting the disk or tool at an angle to the hand-piece or driv- ,y shefi, s hiss O but "W ew a m 7 i ion tee de i m se b 'L tie fe ent,Lise

1. The handpice constructed, substantially as described," with a tubular main section, a m a l lem iq rermmimt theme? and a movable tubularsection pivoted on the main ection. and clamping-arm, for the purposes specified. t

2. The combination, substantially as hereinbefore set forth, of the tubular main section, its clamping-arm, the movable tubular sectiQ' Y p t o hem, an .th t lp nchecr ,whereby the,partsminaynbe clamped in anyad justable position.

3. The combination, substantially as hereth'ehand-piece, for the purposes specified.

- In testimony whereof I have hereunto subscribed my name.

GEORGE H- 0 1 m Witnesses EDW. S. EVABTS, HoRATIoM. Smut. 

